Ellen DeGeneres

Herself

Jamie Lee Curtis

Dr. Judy Peterson (uncredited)

Alex Trebek

Himself

Bill Nye

Himself

Johnny Gilbert

Jeopardy announcer (voice)

Mary Kay Bergman

Female WNRG Newscaster (voice)

Corey Burton

Radio Newscaster(voice)

Olgia Campbell

Jeopardy Assistant

Steven Dean Davis

Multiple Characters (uncredited)

Michael Richards

Caveman discovering fire (uncredited)